EP3655486A1 - Wässrige vernetzbare beschichtungszusammensetzung - Google Patents
Wässrige vernetzbare beschichtungszusammensetzungInfo
- Publication number
- EP3655486A1 EP3655486A1 EP18740600.4A EP18740600A EP3655486A1 EP 3655486 A1 EP3655486 A1 EP 3655486A1 EP 18740600 A EP18740600 A EP 18740600A EP 3655486 A1 EP3655486 A1 EP 3655486A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vinyl polymer
- coating composition
- functional vinyl
- carbonyl functional
- carbonyl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000008199 coating composition Substances 0.000 title claims abstract description 72
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims abstract description 168
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 128
- 239000002253 acid Substances 0.000 claims abstract description 38
- XEVRDFDBXJMZFG-UHFFFAOYSA-N carbonyl dihydrazine Chemical compound NNC(=O)NN XEVRDFDBXJMZFG-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 15
- 239000000178 monomer Substances 0.000 claims description 115
- 239000000203 mixture Substances 0.000 claims description 36
- 238000000576 coating method Methods 0.000 claims description 27
- 239000011248 coating agent Substances 0.000 claims description 23
- 238000001246 colloidal dispersion Methods 0.000 claims description 19
- 239000000758 substrate Substances 0.000 claims description 19
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 16
- 239000000839 emulsion Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 13
- 239000006185 dispersion Substances 0.000 claims description 11
- -1 polypropylene Polymers 0.000 claims description 11
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 10
- 125000000217 alkyl group Chemical group 0.000 claims description 10
- 238000004132 cross linking Methods 0.000 claims description 10
- OMNKZBIFPJNNIO-UHFFFAOYSA-N n-(2-methyl-4-oxopentan-2-yl)prop-2-enamide Chemical compound CC(=O)CC(C)(C)NC(=O)C=C OMNKZBIFPJNNIO-UHFFFAOYSA-N 0.000 claims description 8
- 230000003472 neutralizing effect Effects 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 7
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 7
- 239000004094 surface-active agent Substances 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- CYUZOYPRAQASLN-UHFFFAOYSA-N 3-prop-2-enoyloxypropanoic acid Chemical compound OC(=O)CCOC(=O)C=C CYUZOYPRAQASLN-UHFFFAOYSA-N 0.000 claims description 4
- 239000008365 aqueous carrier Substances 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 claims description 4
- 229920006255 plastic film Polymers 0.000 claims description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 4
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 229920000297 Rayon Polymers 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims description 2
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims description 2
- 230000009477 glass transition Effects 0.000 claims description 2
- 239000010985 leather Substances 0.000 claims description 2
- 239000002649 leather substitute Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000004745 nonwoven fabric Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229920000515 polycarbonate Polymers 0.000 claims description 2
- 239000004417 polycarbonate Substances 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 239000002964 rayon Substances 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims description 2
- 239000004758 synthetic textile Substances 0.000 claims description 2
- 239000002966 varnish Substances 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 210000002268 wool Anatomy 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 1
- 150000002576 ketones Chemical class 0.000 claims 1
- 229910001868 water Inorganic materials 0.000 description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 52
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 32
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 23
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Substances [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 22
- 239000003999 initiator Substances 0.000 description 21
- 239000000243 solution Substances 0.000 description 16
- 229920000642 polymer Polymers 0.000 description 14
- IBVAQQYNSHJXBV-UHFFFAOYSA-N adipic acid dihydrazide Chemical compound NNC(=O)CCCCC(=O)NN IBVAQQYNSHJXBV-UHFFFAOYSA-N 0.000 description 11
- HCOMFAYPHBFMKU-UHFFFAOYSA-N butanedihydrazide Chemical compound NNC(=O)CCC(=O)NN HCOMFAYPHBFMKU-UHFFFAOYSA-N 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 10
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 9
- 239000004971 Cross linker Substances 0.000 description 9
- 230000032683 aging Effects 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 9
- 238000007720 emulsion polymerization reaction Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 8
- 230000007062 hydrolysis Effects 0.000 description 8
- 238000006460 hydrolysis reaction Methods 0.000 description 8
- 125000000468 ketone group Chemical group 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 239000007787 solid Substances 0.000 description 8
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 238000005227 gel permeation chromatography Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 239000002609 medium Substances 0.000 description 7
- 239000004160 Ammonium persulphate Substances 0.000 description 6
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 6
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 6
- 235000019395 ammonium persulphate Nutrition 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 6
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000012299 nitrogen atmosphere Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- BYEAHWXPCBROCE-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-ol Chemical compound FC(F)(F)C(O)C(F)(F)F BYEAHWXPCBROCE-UHFFFAOYSA-N 0.000 description 4
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 4
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Natural products OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 4
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-isoascorbic acid Chemical compound OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 4
- 239000004141 Sodium laurylsulphate Substances 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 4
- 125000004432 carbon atom Chemical group C* 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- 235000010350 erythorbic acid Nutrition 0.000 description 4
- 229940026239 isoascorbic acid Drugs 0.000 description 4
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- 239000003643 water by type Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 3
- PFLUPZGCTVGDLV-UHFFFAOYSA-N acetone azine Chemical compound CC(C)=NN=C(C)C PFLUPZGCTVGDLV-UHFFFAOYSA-N 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000001530 fumaric acid Substances 0.000 description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 3
- 239000011976 maleic acid Substances 0.000 description 3
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- FUHWWEDRJKHMKK-UHFFFAOYSA-N 1-hydroperoxy-2-methylpropane Chemical compound CC(C)COO FUHWWEDRJKHMKK-UHFFFAOYSA-N 0.000 description 2
- JLIDVCMBCGBIEY-UHFFFAOYSA-N 1-penten-3-one Chemical compound CCC(=O)C=C JLIDVCMBCGBIEY-UHFFFAOYSA-N 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 2
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 description 2
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 description 2
- HGINCPLSRVDWNT-UHFFFAOYSA-N Acrolein Chemical compound C=CC=O HGINCPLSRVDWNT-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Chemical compound C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000012736 aqueous medium Substances 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- DIKBFYAXUHHXCS-UHFFFAOYSA-N bromoform Chemical compound BrC(Br)Br DIKBFYAXUHHXCS-UHFFFAOYSA-N 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000012986 chain transfer agent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 125000004386 diacrylate group Chemical group 0.000 description 2
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 2
- 239000003480 eluent Substances 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethyl mercaptane Natural products CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 description 2
- SFNALCNOMXIBKG-UHFFFAOYSA-N ethylene glycol monododecyl ether Chemical compound CCCCCCCCCCCCOCCO SFNALCNOMXIBKG-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 229920001600 hydrophobic polymer Polymers 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 150000007529 inorganic bases Chemical class 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 2
- 150000002825 nitriles Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920001451 polypropylene glycol Polymers 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000002000 scavenging effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000001542 size-exclusion chromatography Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 2
- HJUGFYREWKUQJT-UHFFFAOYSA-N tetrabromomethane Chemical compound BrC(Br)(Br)Br HJUGFYREWKUQJT-UHFFFAOYSA-N 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229940086542 triethylamine Drugs 0.000 description 2
- 238000000825 ultraviolet detection Methods 0.000 description 2
- 229920001567 vinyl ester resin Polymers 0.000 description 2
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 2
- AUHKVLIZXLBQSR-UHFFFAOYSA-N 1,2-dichloro-3-(1,2,2-trichloroethenyl)benzene Chemical compound ClC(Cl)=C(Cl)C1=CC=CC(Cl)=C1Cl AUHKVLIZXLBQSR-UHFFFAOYSA-N 0.000 description 1
- BOVQCIDBZXNFEJ-UHFFFAOYSA-N 1-chloro-3-ethenylbenzene Chemical compound ClC1=CC=CC(C=C)=C1 BOVQCIDBZXNFEJ-UHFFFAOYSA-N 0.000 description 1
- KTZVZZJJVJQZHV-UHFFFAOYSA-N 1-chloro-4-ethenylbenzene Chemical compound ClC1=CC=C(C=C)C=C1 KTZVZZJJVJQZHV-UHFFFAOYSA-N 0.000 description 1
- NVZWEEGUWXZOKI-UHFFFAOYSA-N 1-ethenyl-2-methylbenzene Chemical compound CC1=CC=CC=C1C=C NVZWEEGUWXZOKI-UHFFFAOYSA-N 0.000 description 1
- JZHGRUMIRATHIU-UHFFFAOYSA-N 1-ethenyl-3-methylbenzene Chemical compound CC1=CC=CC(C=C)=C1 JZHGRUMIRATHIU-UHFFFAOYSA-N 0.000 description 1
- OYLCUJRJCUXQBQ-UHFFFAOYSA-N 1-hepten-3-one Chemical compound CCCCC(=O)C=C OYLCUJRJCUXQBQ-UHFFFAOYSA-N 0.000 description 1
- HZDCCHQSZMIRHG-UHFFFAOYSA-N 18-hydroxyoctadecyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCCCCCCCCCCCCCCCO HZDCCHQSZMIRHG-UHFFFAOYSA-N 0.000 description 1
- JHGWYTWADRWKPW-UHFFFAOYSA-N 18-hydroxyoctadecyl prop-2-enoate Chemical compound OCCCCCCCCCCCCCCCCCCOC(=O)C=C JHGWYTWADRWKPW-UHFFFAOYSA-N 0.000 description 1
- WMDZKDKPYCNCDZ-UHFFFAOYSA-N 2-(2-butoxypropoxy)propan-1-ol Chemical compound CCCCOC(C)COC(C)CO WMDZKDKPYCNCDZ-UHFFFAOYSA-N 0.000 description 1
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 1
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- ISRGONDNXBCDBM-UHFFFAOYSA-N 2-chlorostyrene Chemical compound ClC1=CC=CC=C1C=C ISRGONDNXBCDBM-UHFFFAOYSA-N 0.000 description 1
- WDQMWEYDKDCEHT-UHFFFAOYSA-N 2-ethylhexyl 2-methylprop-2-enoate Chemical compound CCCCC(CC)COC(=O)C(C)=C WDQMWEYDKDCEHT-UHFFFAOYSA-N 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- VHSHLMUCYSAUQU-UHFFFAOYSA-N 2-hydroxypropyl methacrylate Chemical compound CC(O)COC(=O)C(C)=C VHSHLMUCYSAUQU-UHFFFAOYSA-N 0.000 description 1
- GWZMWHWAWHPNHN-UHFFFAOYSA-N 2-hydroxypropyl prop-2-enoate Chemical compound CC(O)COC(=O)C=C GWZMWHWAWHPNHN-UHFFFAOYSA-N 0.000 description 1
- IVKYUXHYUAMPMT-UHFFFAOYSA-N 2-methylprop-2-enyl acetate Chemical compound CC(=C)COC(C)=O IVKYUXHYUAMPMT-UHFFFAOYSA-N 0.000 description 1
- RUMACXVDVNRZJZ-UHFFFAOYSA-N 2-methylpropyl 2-methylprop-2-enoate Chemical compound CC(C)COC(=O)C(C)=C RUMACXVDVNRZJZ-UHFFFAOYSA-N 0.000 description 1
- CFVWNXQPGQOHRJ-UHFFFAOYSA-N 2-methylpropyl prop-2-enoate Chemical compound CC(C)COC(=O)C=C CFVWNXQPGQOHRJ-UHFFFAOYSA-N 0.000 description 1
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical compound COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 description 1
- QCAHUFWKIQLBNB-UHFFFAOYSA-N 3-(3-methoxypropoxy)propan-1-ol Chemical compound COCCCOCCCO QCAHUFWKIQLBNB-UHFFFAOYSA-N 0.000 description 1
- OHXAOPZTJOUYKM-UHFFFAOYSA-N 3-Chloro-2-methylpropene Chemical compound CC(=C)CCl OHXAOPZTJOUYKM-UHFFFAOYSA-N 0.000 description 1
- GNSFRPWPOGYVLO-UHFFFAOYSA-N 3-hydroxypropyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCO GNSFRPWPOGYVLO-UHFFFAOYSA-N 0.000 description 1
- QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 description 1
- OFNISBHGPNMTMS-UHFFFAOYSA-N 3-methylideneoxolane-2,5-dione Chemical compound C=C1CC(=O)OC1=O OFNISBHGPNMTMS-UHFFFAOYSA-N 0.000 description 1
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- C09D7/63—Additives non-macromolecular organic
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/12—Polymerisation in non-solvents
- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
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- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/283—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing one or more carboxylic moiety in the chain, e.g. acetoacetoxyethyl(meth)acrylate
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- C—CHEMISTRY; METALLURGY
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
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- C08F220/42—Nitriles
- C08F220/44—Acrylonitrile
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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- C08F220/56—Acrylamide; Methacrylamide
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
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- C09D11/10—Printing inks based on artificial resins
- C09D11/106—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09D11/107—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from unsaturated acids or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/024—Emulsion paints including aerosols characterised by the additives
Definitions
- the present invention relates to the field of acrylic polymer compositions especially those useful in the preparation of coatings.
- the present invention relates to aqueous coating compositions comprising crosslinkable polymer particles dispersed in an aqueous medium and comprising crosslinking agent.
- Aqueous coating compositions containing carbonyl functional vinyl polymers which are crosslinked with polyhydrazides like adipic acid dihydrazide are well known.
- W095/29963 describes a process for preparing aqueous crosslinkable compositions comprising a) preparing an aqueous solution of an acid- functional oligomer and having crosslinker functional groups; b) conducting an aqueous emulsion polymerization to make an aqueous emulsion of an olefinic hydrophobic polymer in the presence of the aqueous oligomer solution, the hydrophobic polymer optionally having crosslinker functional groups ; and c) combining with a crosslinking agent reactable with the crosslinker groups of the oligomer and polymer.
- ADH adipic acid dihydrazide
- SDH succinic acid dihydrazide
- Aqueous coating compositions comprising carbonyl functional vinyl polymers and adipic acid dihydrazide or succinic acid dihydrazide can be effectively applied as a one-pack system without the necessity of mixing reactive materials just prior to application as in a two-pack system.
- One-pack systems containing the carbonyl functional vinyl polymer and adipic acid dihydrazide or succinic acid dihydrazide usually have good storage stability (long pot-life), resulting in good workability.
- a disadvantage of the known crosslinkable vinyl polymer coating compositions is that the polyhydrazide hydrolyzes to a certain extent resulting in the formation of free hydrazine, which is highly toxic and thus very undesirable.
- the hydrazine in the wet coating, formed by hydrolysis of the hydrazide will react instantaneously with the available carbonyl groups in the wet dispersion or coating composition, reducing free hydrazine levels to undetectable values.
- this is different in the dried coating.
- the pH decreases to the acidic regime, generally to a pH of around 4 because of evaporation of the neutralizing alkali (mostly amines, for instance ammonia).
- the scavenging of liberated hydrazine that is formed due to hydrolysis may well result in a low or an unmeasurable level of hydrazine in the coating composition due to the scavenging by the carbonyl groups, however as explained, this is far less the case in a dried coating, where the hydrazine is surrounded by fewer available carbonyl groups and can easily leak out of the film to get released in the environment, like for instance the air or water.
- carbodihydrazide is less prone to hydrolysis than other dihydrazides like adipic acid dihydrazide and succinic acid dihydrazide.
- much less toxic hydrazine is formed through the use of carbodihydrazide, compared to using adipic acid dihydrazide or succinic acid dihydrazide.
- the use of carbodihydrazide will reduce the concerns about the aqua toxicity of which the commonly applied dihydrazides like adipic acid dihydrazide and succinic acid dihydrazide are suffering.
- This patent publication describes a resinous composition for a two-pack system comprising (A) a colloidal dispersion or emulsion obtained by solution copolymerization of a monomer mixture comprising a carbonyl group-containing unsaturated monomer, carboxyl-group containing unsaturated monomer and other unsaturated monomers to form a copolymer, neutralizing the copolymer with an alkali, dissolving or emulsifying it into water, and adjusting the pH to above 7, and (B) an easily water soluble dihydrazide compounds having from 1 to 5 carbon atoms like for example carbodihydrazide.
- US-A-5821295 teaches that the pot-life can be controlled (and hence early reaction of the
- Example 4 reports a pot-life of 3 hours at a pH of 10.5, which is relatively short for a two-pack system, let alone for a one-pack coating composition which usually requires a pot life of at least one year at 25 °C.
- the object of the present invention is to provide a one-pack aqueous crosslinkable coating composition
- a one-pack aqueous crosslinkable coating composition comprising an aqueous colloidal dispersion of carbonyl functional vinyl polymer and a crosslinking agent that is less prone to hydrolysis than adipic acid dihydrazide and succinic acid dihydrazide.
- an aqueous coating composition comprising carbodihydrazide and an aqueous colloidal dispersion of carbonyl functional vinyl polymer(s), whereby the equivalent molar ratio of hydrazide groups to carbonyl groups is from 0.1 to 0.95; the ratio of number-average molecular weight of the carbonyl functional vinyl polymer(s) to acid value of the carbonyl functional vinyl polymer(s) is higher than 400; and the acid value of the carbonyl functional vinyl polymer(s) is from 2 to 100 mg KOH/gram of the carbonyl functional vinyl polymer.
- aqueous coating compositions according to the invention provide crosslinkable compositions which can be applied as one-pack systems and whereby the crosslinking agent is less prone to hydrolysis than adipic acid dihydrazide and succinic acid dihydrazide.
- a one-pack coating composition is a coating composition having a pot life of at least one year at 25 °C.
- Pot life also referred to as shelf life
- Pot life is defined as the amount of time it takes for the initial viscosity of a mixture to double, or quadruple for lower viscosity products ( ⁇ 1000 cPs). Timing starts from the moment the product is mixed, and is measured at 25 ° C.
- a pot life of at least one year at 25 °C is commonly accepted as being equivalent to a pot-life of four weeks at 50 °C.
- the present invention relates to an aqueous coating composition
- an aqueous coating composition comprising carbodihydrazide and an aqueous colloidal dispersion of carbonyl functional vinyl polymer(s), whereby the equivalent molar ratio of hydrazide groups to carbonyl groups is from 0.1 to 0.95; the ratio of number-average molecular weight of the carbonyl functional vinyl polymer(s) to acid value of the carbonyl functional vinyl polymer(s) is higher than 400; and the acid value of the carbonyl functional vinyl polymer(s) is from 2 to 100 mg KOH/gram carbonyl functional vinyl polymer.
- the equivalent molar ratio of hydrazide groups to carbonyl groups in the coating composition of the invention is from 0.1 to 0.95 and preferably from 0.2 to 0.95.
- the equivalent molar ratio is calculated by dividing the molar amount of hydrazide groups by the molar amount of carbonyl groups reactive with hydrazide groups.
- the molar amounts are calculated from the amount of carbonyl functional monomers (i.e.
- carbodihydrazide is considered to have two hydrazide groups.
- the carbodihydrazide can be incorporated into the invention composition by simple admixture with the aqueous colloidal dispersion of carbonyl functional vinyl polymer(s).
- the carbodihydrazide can be added as a solid material or as a solution in water.
- the ratio of number-average molecular weight (M n ) of the carbonyl functional vinyl polymer(s) to acid value (AV) of the carbonyl functional vinyl polymer(s) is higher than 400, preferably higher than 600, more preferably higher than 800, even more preferably higher than 1200 and even more preferably higher than 1500.
- the ratio of number-average molecular weight (M n ) of the carbonyl functional vinyl polymer(s) to acid value (AV) of the carbonyl functional vinyl polymer(s) is preferably lower than 1500000, more preferably lower than 800000, even more preferably lower than 400000, even more preferably lower than 50000, even more preferably lower than 10000 and most preferably lower than 5000. (The fraction of a polymer that has been crosslinked during synthesis and that will not dissolve in the solvent used for size exclusion chromatography measurement will be assumed to have an M n of 1500000.).
- the number-average molecular weight of the carbonyl functional vinyl polymer(s) is determined by size exclusion chromatography in hexafluoroisopropanol (HFIP): The number-average molecular weight of the carbonyl functional vinyl polymer(s) is measured with three silica modified 7 ⁇ PFG columns at 40°C on a Waters Alliance 2695 LC system with a Waters 2410 DRI detector and a Waters 2996 PDA detector. Hexafluoroisopropanol (HFIP) and PTFA 0.1 % is used as eluent with a flow of 0.8 mL/min. The samples are dissolved in the eluent using a concentration of 5 mg polymer per mL solvent.
- HFIP hexafluoroisopropanol
- the solubility is judged with a laser pen after 24 hours stabilization at room temperature; if any scattering is visible the samples are filtered first and 150 ⁇ sample solution is injected.
- the MMD (molecular mass distribution) results are calculated with 1 1 narrow poly methylmethacrylate standards from 645-1.677.000 Da.
- the acid value of the carbonyl functional vinyl polymer(s) can thus be controlled by the molar amount of carboxylic acid components that is used to prepare the carbonyl functional vinyl polymer(s).
- the carbonyl functional vinyl polymer(s) has an acid value of at least 2 mg KOH/gram carbonyl functional vinyl polymer. Carbonyl functional vinyl polymers with a lower acid value will usually not be plasticized by water resulting in an increased solvent demand in the coating composition to ensure proper film formation.
- the carbonyl functional vinyl polymer(s) has an acid value of preferably at least 5 mg KOH/gram carbonyl functional vinyl polymer and more preferably the acid value is at least 9 mg KOH/gram carbonyl functional vinyl polymer.
- the carbonyl functional vinyl polymer(s) has an acid value of at most 100 mg KOH/gram carbonyl functional vinyl polymer. Carbonyl functional vinyl polymers with a higher acid value will show increased water sensitivity in the coatings derived thereof.
- the carbonyl functional vinyl polymer(s) preferably has an acid value of at most 80 mg KOH/gram carbonyl functional vinyl polymer and more preferably the acid value is most 75 mg KOH/gram carbonyl functional vinyl polymer.
- the acid value of the carbonyl functional vinyl polymer(s) is preferably in the range from 5 to 80 mg KOH/gram carbonyl functional vinyl polymer and more preferably in the range from 9 to 75 mg KOH/gram carbonyl functional vinyl polymer.
- the coating composition according to the invention preferably comprises carbodihydrazide in an amount of less than 3 wt.% and more than 0.05 wt.%, preferably in an amount of less than 1.5. wt.%, relative to the total amount of monomers charged for the preparation of the carbonyl functional vinyl polymer(s).
- Carbodihydrazide has the following structural formula:
- carbodihydrazide gives less hydrolysis at the relevant conditions tested (pH 4 and at temperatures of 30 °C and 50 °C), but that it may also suffer from breaking down in time due to the oxidizing medium of a freshly prepared emulsion where typically strong oxidizing components such as most initiators (including persulphates and peroxides) are used in the process.
- the finished polymeric dispersion and the coating composition comprising the aqueous colloidal polymeric dispersion should be in a reductive regime which can be established by measuring the redox potential of the dispersion against a Pt/Ag/AgCI (saturated KCI) electrode, calibrated with a +475 mV reference solution according to ASTM D 1498.
- Pt/Ag/AgCI saturated KCI
- the redox potential of the aqueous colloidal dispersion of carbonyl functional vinyl polymer(s) is preferably ⁇ +90 mV, more preferably ⁇ +50 mV and most preferably ⁇ +10 mV.
- the redox potential of the aqueous coating composition of the invention is preferably below +32.5 mV, more preferably ⁇ +12.5 mV, most preferably ⁇ +2.5 mV at pH 7 of the coating composition. This results in an improved retention of the crosslinker and hence to an improved shelf stability.
- the preferred redox potential value of the aqueous colloidal dispersion of carbonyl functional vinyl polymer(s) (prior to the addition of carbodihydrazide) or the preferred redox potential value of the aqueous coating composition of the invention (after addition of the carbodihydrazide) at a pH of y can be calculated from the redox potential value at a pH of x by the following formula:
- Redox potential Rp @ pH y in mV is ⁇ [Rp @ pHx - ((pH(y) - pHx) * 25)]
- the redox potential at pH y is:
- the redox potential at a pH of 7 is:
- Redox potential Rp @ pH y in mV is ⁇ Rp@pHx - ((pH(y) - pHx) * 25)
- a vinyl polymer generally herein a polymer derived from the addition polymerisation (normally by a free-radical process) of at least one olefinically unsaturated monomer.
- a vinyl monomer is therefore meant herein an olefinically unsaturated monomer.
- an aqueous colloidal dispersion of carbonyl functional (i.e. carbonyl group containing) vinyl polymer(s) is meant herein a dispersion of the carbonyl functional vinyl polymeric component in a liquid carrier medium of which water is the principal component (at least 50 percent by weight, more usually at least 90 percent by weight of the carrier medium).
- the aqueous coating composition according to the invention comprises dispersed carbonyl functional (i.e. containing carbonyl group(s) reactive with a hydrazide group) vinyl polymer particles.
- the colloidal dispersion of carbonyl functional vinyl polymer particles is preferably obtained by copolymerizing, preferably by emulsion polymerisation of, a monomer mixture comprising carbonyl functional olefinically unsaturated monomer(s), carboxylic acid functional olefinically unsaturated monomer(s) and other olefinically unsatured monomer(s) to form a copolymer, optionally neutralizing the copolymer with a base, and adjusting the pH to a value of at least 6.8.
- the coating composition comprises dispersed anionically stabilized carbonyl functional vinyl polymer particles preferably obtained by effecting an anionic charge reversal of at least a part of the carboxylic acid which is preferably introduced in the carbonyl functional vinyl polymer via the use of carboxylic acid functional olefinically unsaturated monomer(s).
- the carbonyl groups are introduced in the vinyl polymer by copolymerizing carbonyl group containing olefinically unsaturated monomers (i.e. containing carbonyl group(s) reactive with a hydrazide group) with at least one other olefinically unsaturated monomer.
- olefinically unsaturated monomers i.e. containing carbonyl group(s) reactive with a hydrazide group
- acetoacetoxy(meth)acrylate is not applied for preparing the carbonyl functional vinyl polymer since acetoacetoxy(meth)acrylate results in discoloration upon reaction with hydrazide.
- the carbonyl groups reactive with a hydrazide group are ketone groups.
- the ketone groups are introduced in the vinyl polymer by copolymerizing ketone group containing olefinically unsaturated monomers with at least one other olefinically unsaturated monomer.
- the ketone groups are introduced in the vinyl polymer by copolymerizing ketone group containing olefinically unsaturated monomers with at least one carboxylic acid functional olefinically unsaturated monomer and at least one other olefinically unsaturated monomer (different than the ketone group containing olefinically unsaturated monomer(s) and different than the carboxylic acid functional olefinically unsaturated monomer).
- the ketone group containing olefinically unsaturated monomers are preferably selected from the group consisting of methacrolein, acrolein, diacetone acrylamide, vinyl methyl ketone, vinyl ethyl ketone, vinyl butyl ketone, and any mixture thereof. More preferably, the carbonyl groups are introduced in the vinyl polymer by copolymerizing of diacetone acrylamide with at least one other olefinically unsaturated monomer.
- the carbonyl groups are introduced in the vinyl polymer by copolymerizing of diacetone acrylamide with at least one carboxylic acid functional olefinically unsaturated monomer and at least one other olefinically unsaturated monomer (different than the carbonyl group containing olefinically unsaturated monomer(s) and different than the carboxylic acid functional olefinically unsaturated monomer).
- diacetone acrylamide has one carbonyl group, i.e. one ketone group, reactive with a hydrazide group.
- carboxylic acid groups, carboxylic acid ester groups and amide groups are not carbonyl groups reactive with hydrazide groups.
- the amount of carbonyl functional olefinically unsaturated monomer(s), based on the total amount of monomers used to prepare the carbonyl functional vinyl polymer is generally from 0.1 to 20 wt.%.
- the amount of carbonyl functional olefinically unsaturated monomer(s), based on the total amount of monomers used to prepare the carbonyl functional vinyl polymer is preferably less than 15 wt.%, more preferably less than 8 wt.% and most preferably less than 5 wt.% in order to minimalize water sensitivity of the coating.
- the amount of carbonyl functional olefinically unsaturated monomer(s), based on the total amount of monomers used to prepare the carbonyl functional vinyl polymer, is preferably at least 0.3 wt.%, more preferably at least 0.5 wt.%, more preferably at least 1 wt.% and most preferably at least 2 wt.%. Preferably at least 60 wt.
- % of all polymer chains do contain copolymerized carbonyl functional monomer, and more preferably all monomer phases added to the reactor during the synthesis of the polymer do contain at least 0.3 wt.% on monomer of a carbonyl functional monomer (this to obtain a well crosslinked network after drying of the coating), more preferred this carbonyl functional monomer is diacetone acrylamide.
- the carboxylic acid functional olefinically unsaturated monomer(s) are preferably selected from the group consisting of acrylic acid, methacrylic acid, and ⁇ -carboxyethyl acrylate, citraconic acid, crotonic acid, fumaric acid, itaconic acid, monoalkyl esters of itaconic acid such as for example monomethyl itaconate, maleic acid, and potentially carboxylic acid functional olefinically unsaturated monomers such as itaconic anhydride or maleic anhydride, and combinations thereof; more preferably the carboxylic acid functional olefinically unsaturated monomer is acrylic acid, methacrylic acid, ⁇ -carboxyethyl acrylate and mixtures thereof. Most preferred carboxylic acid functional olefinically unsaturated monomer is methacrylic acid.
- the other olefinically unsaturated monomer(s) i.e. those different than the carbonyl group containing olefinically unsaturated monomer(s) and different than the carboxylic acid functional olefinically unsaturated monomer(s)
- olefinically unsaturated monomer(s) preferably include defines such as ethylene or propylene; vinyl halides such as vinylidene chloride and vinyl chloride; olefinically unsaturated amides; vinyl esters; vinyl ethers; olefinically unsaturated nitriles; heterocyclic vinyl compounds; diesters of fumaric and maleic acid; and, in particular, esters of acrylic acid and methacrylic acid of formula:
- CH 2 CR 4 C0 2 R 5 (1 ) where R 4 is H or methyl and R 5 is optionally substituted alkyl of 1 to 20 carbon atoms (more preferably 1 to 8 carbon atoms) or cycloalkyl of 5 to 12 ring carbon atoms.
- Such monomers include alkylesters such as methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, i-butyl acrylate, t-butyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, isopropyl acrylate, cyclohexyl acrylate, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, t-butyl methacrylate, cyclohexyl
- vinyl esters such as allyl acetate, allyl chloroacetate, methallyl acetate, vinyl acetate, isopropenyl acetate; halides such as vinyl chloride, vinylidene chloride, allyl chloride, 1 ,2-dichloropropene-2, methallyl chloride and trichloroethylene; nitriles such as acrylonitrile and methacrylonitrile; aryls such as styrene, a-methyl styrene, o-methyl styrene, m-methyl styrene, p-methyl styrene, pentachlorostyrene, o-chlorostyrene, m-chlorostyrene, p-ch
- hydroxystearyl methacrylate dihydroxy alkyl (preferably 1 to 6C) adducts of maleic acid, fumaric acid, and phthalic acid; polyethylene oxide or polypropylene oxide functionalised hydroxyl functional (meth)acrylates.
- monomers in this paragraph exclude carbonyl group-containing olefinically unsaturated monomers and carboxylic acid olefinically unsaturated monomer.
- the other olefinically unsaturated monomer(s) i.e.
- those different than the carbonyl group containing olefinically unsaturated monomer(s) and different than the carboxylic acid functional olefinically unsaturated monomer(s)) are preferably used in an amount within the range of from 78 to 98 weight percent based on the total amount of monomers used to prepare the carbonyl functional vinyl polymer, more preferably from 83 to 97 weight percent. (It is to be understood the weight percent of all monomers used to prepare the carbonyl functional vinyl polymer must add up to 100).
- the amount of non-ionic (so not containing a ionizable group) monomers that contribute to the water solubility of the carbonyl functional vinyl polymer including for example (meth)acrylamide, hydroxyethyl(meth)acrylate, polyethylene glycol (400) diacrylate, polyethylene glycol (600) diacrylate,
- ethyldiglycolacrylate, and hydroxybutyl acrylate is preferably less than 15 wt%, more preferred less than 6 weight % and most preferred less than 3 weight%, based on the total amount of monomers used to prepare the carbonyl functional vinyl polymer.
- the carbonyl functional vinyl polymer is preferably obtained by copolymerizing a monomer mixture comprising from 70 to 98 weight %, more preferably from 80 to 97 weight % and most preferably from 85 to 96 weight % of styrene, acrylonitrile and/or alkyl(meth)acrylate monomers where the alkyl has a chain length of 1 -1 1 carbons, based on the total amount of monomers used to prepare the carbonyl functional vinyl polymer.
- the carbonyl functional vinyl polymers of the composition is obtained by copolymerizing a monomer mixture consisting of (i) diacetone acrylamide, (ii) (meth)acrylic acid and/or
- betacarboxyethylacrylate (iii) styrene, acrylonitrile and/or alkyl(meth)acrylate monomers where the alkyl has a chain length of 1-1 1 carbons and (iv) optionally other monomers, where the total amount of other monomers is less than 5 weight%, more preferred less than 2 weight%, based on the total amount of monomers used to prepare the carbonyl functional vinyl polymer .
- the average particle size of the carbonyl functional vinyl polymer(s) is within the range of from 20 to 500 nm, more preferably from 40 to 250 nm and most preferably from 50 to 150 nm.
- Average particle size herein is that as determined by light scattering using a Malvern Zetasizer 3000 HSa).
- the carbonyl functional vinyl polymer(s) has an average glass transition temperature (Tg) within the range of from -50 °C to 120 °C. Below -50 °C the resulting coating is not likely in some applications to have sufficient chemical resistance, and above 120 °C the coating compositions may require in some applications an undesirably large amount of coalescent (a coalescent is an organic solvent or plasticizer that lowers the minimum film forming temperature of a polymer, thereby permitting a coating from the polymer to form a useful film at a temperature below the Tg of the polymer) which will detract from the coating properties.
- Tg average glass transition temperature
- the average Tg of the carbonyl functional vinyl polymer(s) is more preferably in the range of from 0 to 60 °C, even more preferably in the range of from 5 to 60 °C.
- the average Tg of the carbonyl functional vinyl polymer(s) is preferably lower than 50 °C and more preferably lower than 40 °C.
- the Tg of a polymer is that temperatures at which the polymer changes from a rubbery, elastic state to a glassy, brittle state.
- Tg values may be determined experimentally using, inter alia, differential scanning calorimetry DSC, or calculated using the well-known Fox equation. Calculation of the Tg by means of the Fox equation is done as follows.
- the Tg, in Kelvin, of a copolymer having "n" copolymerised comonomers is given by the weight fractions W of each comonomer type and the Tg's of the homopolymers (in Kelvin) derived from each comonomer according to the equation:
- the calculated Tg in Kelvin may be readily converted to °C.
- the colloidal dispersion of carbonyl functional vinyl polymer(s) is preferably obtained by emulsion polymerization using conventional emulsion polymerisation conditions.
- Methods for preparing vinyl polymers by emulsion polymerization are known in the art and are described in for example Handbook Emulsion Polymerization: Theory and Practice, 1975, by D.C. Blackley (ISBN 978-0- 85334-627-2).
- the emulsion polymerization to obtain carbonyl functional vinyl polymer(s) is a free-radical emulsion polymerization that is conducted using appropriate heating and agitation (stirring).
- the free-radical emulsion polymerization is usually effected at atmospheric pressure and a temperature in the range from 30 to 100 °C.
- Suitable free-radical-yielding initiators include persulphates such as ammonium, K and Na salts of persulphate, or redox initiator systems; combinations such as t-butyl hydroperoxide or hydrogen peroxide or cumene hydroperoxide, with isoascorbic acid or sodium formaldehydesulphoxylate, and optionally FeEDTA are useful.
- the amount of initiator, or initiator system is generally 0.05 to 3 wt.% based on the weight of total monomers charged.
- the molecular weight M n of the carbonyl functional vinyl copolymer(s) can be controlled by the use of well-known chain transfer agents.
- Preferred chain transfer agents can include mercaptanes and alkyl halogenides.
- the chain transfer agent is selected from the group of lauryl mercaptane, n-dodecyl mercaptane, 3-mercapto propionic acid, i-octyl thioglycolate, mercaptoethanol, tetrabromo methane, or tribromo methane.
- the chain transfer agent is a mercaptane, selected from the group of lauryl mercaptane, 3-mercapto propionic acid, n-dodecyl mercaptane, i-octyl thioglycolate, and/or mercaptoethanol.
- An emulsion polymerisation process used for making the colloidal dispersion of carbonyl functional vinyl polymer(s) may be carried out using an "all-in-one" batch process (i.e. a process in which all the materials to be employed are present in the polymerisation medium at the start of polymerisation) or a semi-batch process in which one or more of the materials employed (usually at least one of the monomers), is wholly or partially fed to the polymerisation medium during the polymerisation.
- an "all-in-one" batch process i.e. a process in which all the materials to be employed are present in the polymerisation medium at the start of polymerisation
- a semi-batch process in which one or more of the materials employed (usually at least one of the monomers), is wholly or partially fed to the polymerisation medium during the polymerisation.
- the carbonyl functional vinyl polymer may be made using a single monomer feed containing all or substantially all the monomers for the polymerisation, or two or more monomer feeds (usually just two) may be used in which some of the monomers for the polymerisation are in one of the feeds and the other monomers are in the other feed (or feeds).
- Such multi feeds may be fed to the polymerisation at the same time or may be added sequentially.
- one of the feeds is fed to another feed while the latter is itself being fed to the polymerisation (this being known in the art as a "powerfeed" process).
- surfactant Preferably, from 0.1 to 8 wt.%, more preferably from 0.3 to 5 wt.% and most preferably from 0.5 to 3 wt % of surfactant is used based on total amount of monomers charged for the preparation of the carbonyl functional vinyl polymer(s).
- Preferred surfactants include the alkali metal and ammonium salts of anionic types like sulphates, sulphonates, sulphosuccinates, and phosphates and surfactants which have both anionic groups as well as a nonionic (like polyoxyethylene and/or polyoxypropylene) block. Due to toxicity reasons nonylphenol based surfactants are less preferred.
- the emulsion polymerisation is preferably generally performed under acidic conditions, i.e. pH ⁇ 7, although performing the polymerisation can also be done at higher pH.
- pH is raised at the end of the polymerisation process.
- bases include organic amines such as trialkylamines (e.g. triethylamine, tributylamine), morpholine and alkanolamines, and inorganic bases such as ammonia, NaOH, KOH, and LiOH.
- the aqueous medium containing the carbonyl functional vinyl polymer may already be alkaline (or sufficiently alkaline) such that the acid groups (such as carboxyl groups) become neutralized without the requirement for positively adding a base to raise pH, or the acid groups may be or include very strong acid groups such as sulphonic acid groups (pKa 1 to 2) so that neutralization may not be necessary.
- acid monomers it is possible for acid monomers to be polymerised in salt form rather than as the free acid. Ammonia is most preferred as neutralisation agent.
- the pH of the coating composition of the invention is preferably above 7, more preferably above 7.5 and most preferably above 8.
- the pH of the coating composition of the invention is at most 10 and more preferably at most 9.5.
- ammonia is used as main neutralizing agent, with main meaning that more equivalents of ammonia are used than of other neutralizing agent in the total neutralizing agent mixture.
- Most preferred ammonia is the only neutralizing agent added after completion of the emulsion polymerization. Customers prefer to use coatings with a low odor content and therefore it is preferred to use relatively low levels of volatile amines.
- a pH above 10 is less desirable, especially when tertiary amines like dimethyl ethanolamine and triethyl amine are used to obtain these high pH values due to their toxicity, while ammonia will give a penetrant odor at pH levels above this value.
- An additional advantage of using coating compositions with a pH lower than 10 is that a part of the crosslinking is believed to already take place after combining the dihydrazide with the carbonyl functional polymer. This will give some crosslinking inside the particles and we have surprisingly found that this does not interfere with the film formation process after application of the composition on a surface.
- the crosslinking during storage leads to less free hydrazide groups during storage of the coating composition and this means that the chances of hydrolysis of the hydrazide during storage are further being reduced.
- the aqueous colloidal dispersion of the carbonyl functional vinyl polymer(s) preferably has a polymer solids content within the range of from 20 to 60 weight percent (more preferably 25 to 55 weight percent).
- the coating compositions may contain other ingredients, additives or auxiliaries, such as coalescents, pigments, dyes, emulsifiers (surfactants), pigment dispersion aids, crosslinking catalysts, levelling agents, waxes, matting agents, anti-cratering agents, antifoam agents, thickeners, sedimentation inhibitors, heat stabilisers, UV absorbers, antioxidants, and fillers.
- additives or auxiliaries such as coalescents, pigments, dyes, emulsifiers (surfactants), pigment dispersion aids, crosslinking catalysts, levelling agents, waxes, matting agents, anti-cratering agents, antifoam agents, thickeners, sedimentation inhibitors, heat stabilisers, UV absorbers, antioxidants, and fillers.
- coalescents into the composition would for the purpose of optimising or fine-tuning film-forming properties, usually being present in an amount of 0 to 55 weight percent, more preferably 1 to 20 weight percent, still more preferably 2-10 weight percent, based on the weight of the aqueous colloidal dispersion of the carbonyl functional vinyl polymer(s).
- suitable coalescents include dipropylene glycol mono n-butyl ether, dipropylene glycol mono methyl ether, butyl glycol, ethylene diglycol, and 2,2,4-trimethyl-1 ,3-pentene diol monoisobutylate.
- Such other ingredients, additives and auxiliaries are usually best incorporated into the the aqueous colloidal dispersion before the addition of carbodihydrazide.
- the coating compositions once applied may be allowed to dry naturally at ambient temperature, and/or the drying process may be accelerated by heat.
- Crosslinking can be developed by allowing to stand for a prolonged period at ambient temperature (e.g. several days) and/or by heating at an elevated temperature (e.g. from 50 °C to 160 °C) for a much shorter period of time (in which case the drying and crosslink development steps can be combined into one operation if desired).
- ambient temperature in this specification is meant for practical purposes a temperature within the range of from 15 to 30 °C.
- the present invention further relates to the use of an aqueous colloidal dispersion comprising dispersed carbonyl functional vinyl polymer(s) particles for preparing the one-pack aqueous coating composition as defined above by mixing carbodihydrazide and the aqueous colloidal polymeric dispersion, whereby the amount of carbodihydrazide and carbonyl groups present in the coating composition is such as to result in an equivalent molar ratio of hydrazide groups to carbonyl groups from 0.1 to 0.95, whereby the ratio of number-average molecular weight of the carbonyl functional vinyl polymer(s) to acid value of the carbonyl functional vinyl polymer(s) is higher than 400, and the acid value of the carbonyl functional vinyl polymer(s) is from 2 to 100 mg KOH/gram carbonyl functional vinyl polymer.
- a method of coating a substrate which method comprises applying a coating composition as defined above to a substrate, causing or allowing the aqueous carrier medium of the composition to be removed, and developing crosslinking of the coating that has been applied to the substrate.
- crosslinked coating which has been derived from a coating composition as defined above.
- a coated substrate which has been prepared by applying a coating composition as defined above to a substrate, causing or allowing the aqueous carrier medium of the composition to be removed, and developing crosslinking of the coating that has been applied to the substrate.
- the substrate is preferably selected from the group consisting of
- plastic films such as polypropylene, polyethylene, polyester, polyamide, PVC, polycarbonate, polystyrene, polyurethane, PET, biaxially oriented polypropylene and biaxially oriented PET plastic films,
- the coating composition of this invention can be used for obtaining a traditional coating and is preferably used as an ink or overprint varnish.
- the present invention therefore further relates to an ink comprising a coating composition as described above or obtained with the process to prepare the coating composition as described above and a colorant.
- the present invention further relates a process for printing, preferably gravure and flexo printing, an image on a substrate comprising applying such an ink.
- the hydrolytic stability of dihydrazides was determined by dissolving 1 .00 g of dihydrazide (adipic dihydrazide, succinic dihydrazide and carbodihydrazide) in 100 mL of demineralized water in a closed container. The pH of the solution ( ⁇ 7,5) was adjusted to pH 4 by addition of 1 M HCI. The closed containers were stored at 30°C and 50°C.
- a sample was taken from this mother-solution and analyzed for its free hydrazine content.
- the sample (0.1 mL) was mixed with 0.95 mL of a 9:1 water/acetone mixture and thoroughly mixed for 30 minutes.
- the amount of acetone ketazine (obtained by reaction of acetone and hydrazine) was determined by HPLC.
- Hydrazine was calibrated externally with a hydrazine in water solution prepared from hydrazinesulphate, that was derivatized analogously to the above-mentioned procedure.
- a standard 5-point calibration from 0.03 mg/mL up to 4 mg/mL was used for the samples with a low concentration and up to 100 mg/mL was used for the samples with a high concentration of acetone ketazine.
- Acetone ketazine was measured on a Waters Acquity H-Class UPLC with UV detection: 100 mm T3 column at 40°C, 1 ⁇ injection, 0.4 mL/min flow, UV detection at 240 nm, H2O to acetonitrile gradient.
- Table 1 Analysis of the amount of hydrazine formation in 1 % dihydrazide solution in water (pH 4, 30°c) (ppm, +/- 1 ppm)
- Table 2 Analysis of the amount of hydrazine formation in 1 % dihydrazide solution in water (pH 4, 50°c) (ppm, +/- 1 ppm)
- an initiator feed consisting of 2 parts of ammonium persulphate in 90 parts of demineralized water was added. Subsequently the reactor was heated to a temperature of 85°C and monomer and initiator feeds were started. The monomer feed contained the remaining 90% of the aforementioned monomeric emulsion and was added over 50 minutes, while the remaining 70% of the initiator feed was added over 60 minutes. After feed conclusion, the vessels were rinsed with demineralized water. The reaction temperature of 85°C was maintained for 20 minutes, after which the reactor contents were cooled to 25°C and the pH brought to 8-8.6 with 12.5% v/v aqueous ammonia. After 30 minutes of mixing, 4 parts of CDH were added, rinsed with 20 parts of demineralized water and mixed for a further 5 minutes.
- the molar ratio of hydrazide to carbonyl groups is 0.83, the number average molecular weight (M n ) as determined by gel permeation chromatography was 6.7E3 Da and the calculated acid value (AV) amounted to 10 mg KOH/g solids. This results in an M n /AV ratio of 670.
- Example 2 was repeated, but using the monomer composition as given in Table 4.
- the molar ratio of hydrazide to carbonyl groups is 0.83, the number average molecular weight (M n ) as determined by gel permeation chromatography was 6.9E3 Da and the calculated acid value (AV) amounted to 6 mg KOH/g solids. This results in an M n /AV ratio of 1 150.
- Initial viscosity measurement yields a value of 5 mPa.s, and after aging at 50 °C for 4 weeks a value of 3 mPa.s is measured.
- demineralized water was heated to 70°C under nitrogen atmosphere. At a temperature of 70°C, 10% of an emulsified monomer feed, constituted as described in the table below, was added.
- demineralized water was prepared, as well as a reductor solution of 0,1 parts isoascorbic acid in 7 parts demineralized water. The latter was brought to pH 7-8 with 12,5% v/v aqueous ammonia. At 55°C, 33% of the monomer feed was added to the reactor in 8 minutes, followed by a 15-minute mixing period. Then 75% of the oxidator solution was added to the reactor, followed by 75% of the reductor solution. After completion of the exotherm and 10 minutes of temperature drift, 1 12 parts of demineralized water were added and the reactor cooled to 55°C. Subsequently, 0,01 parts of Fe(lll)EDTA were added, followed by another 33% of the monomer feed over 8 minutes.
- the molar ratio of hydrazide to carbonyl groups is 0.85, the number average molecular weight as determined by gel permeation chromatography was 1.54E4 Da and the calculated acid value (AV) amounted to 10 mg KOH/g solids. This results in an M n /AV ratio of 1540.
- MEK-rubs were performed in triplicate using a SDL Atlas CM-5 AATCC Crockmeter with butanone (MEK) as the solvent and a probe weight of 9 N.
- MEK butanone
- Performance of the CDH-crosslinked binders was compared to an ADH- crosslinked benchmark using spot tests.
- the composition as synthesized in Example 4 (before aging) was applied to Leneta test cards using 100 ⁇ wire rod applicators (Test 4b-1 ).
- films were also cast from the same composition except using adipic acid dihydrazide ADH (the same amount on a molar basis as CDH) as a crosslinker (instead of carbodihydrazide CDH) (Test 4b-2) and from the same composition lacking a crosslinker (Test 4b-3). The films were incubated at 50°C for 1 hour, then further dried for 16 hours at 25 °C.
- a reactor phase consisting of 2 parts of sodium laureth (12 EO) sulphate in 750 parts of demineralized water was heated to 80°C under nitrogen atmosphere. At a temperature of 80°C, 10% of an emulsified monomer feed, constituted as described in the table below, was added.
- an initiator feed consisting of 3 parts of ammonium persulphate in 13 parts of demineralized water was added.
- the reactor was heated to a temperature of 82°C and stirred for 5 minutes.
- the monomer feed contained the remaining 90% of the aforementioned monomeric emulsion and was then added over 90 minutes.
- the vessels were rinsed with demineralized water. The reaction temperature of 82°C was maintained for 15 minutes, after which the reactor contents were cooled to 60°.
- Example 5 was repeated, using the monomer composition as described in the table below.
- the molar ratio of hydrazide to carbonyl groups is 0.90, the number average molecular weight as determined by gel permeation chromatography was 2.25E4 Da and the calculated acid value (AV) amounted to 25 mg KOH/g solids. This results in an M n /AV ratio of 900.
- Initial viscosity measurement yields a value of 10 mPa.s, and after aging at 50 °C for 4 weeks a value of 1 1 mPa.s is measured.
- the reactor was heated to a temperature of 85°C and monomer and initiator feeds were started.
- the monomer feed contained the remaining 90% of the aforementioned monomeric emulsion and was added over 50 minutes, while the remaining 70% of the initiator feed was added over 60 minutes.
- the vessels were rinsed with demineralized water.
- the reaction temperature of 85°C was maintained for 20 minutes, after which the reactor contents were cooled to 25°C.
- 700 parts of demineralized water were added and the pH was brought to 8-8.6 with 12.5% v/v aqueous ammonia.
- After 30 minutes mixing, 4.5 parts of CDH were added, rinsed with 20 parts of demineralized water and mixed for a further 5 minutes.
- a reactor phase consisting of 2 parts of sodium lauryl sulphate in 560 parts of demineralized water was heated to 70°C under nitrogen atmosphere.
- a temperature of 70°C 10% of an emulsified monomer feed, constituted as described in the table below, was added.
- the reactor was heated to a temperature of 85°C and monomer and initiator feeds were started.
- the monomer feed contained the remaining 90% of the aforementioned monomeric emulsion and was added over 50 minutes, while the remaining 70% of the initiator feed was added over 60 minutes.
- the vessels were rinsed with demineralized water.
- the reaction temperature of 85°C was maintained for 20 minutes, after which the reactor contents were cooled to 25°C.
- 700 parts of demineralized water were added and the pH was brought to 8-8.6 with 12.5% v/v aqueous ammonia.
- After 30 minutes mixing, 4.5 parts of CDH were added, rinsed with 20 parts of demineralized water and mixed for a further 5 minutes.
- the reactor was heated to a temperature of 85°C and monomer and initiator feeds were started.
- the monomer feed contained the remaining 90% of the aforementioned monomeric emulsion and was added over 50 minutes, while the remaining 70% of the initiator feed was added over 60 minutes.
- the vessels were rinsed with demineralized water.
- the reaction temperature of 85°C was maintained for 20 minutes, after which the reactor was cooled to 70°C, 500 parts of demineralized water were added and the pH was brought to 8-8,6 with 12,5% v/v aqueous ammonia. After cooling to 25°C and mixing for 30 minutes, 5 parts of CDH were added, rinsed with 20 parts of demineralized water and mixed for a further 5 minutes.
- the molar ratio of hydrazide to carbonyl groups is 0.82, the number average molecular weight as determined by gel permeation chromatography was 1.93E3 Da and the calculated acid value (AV) amounted to 99 mg KOH/g solids. This results in an M n /AV ratio of 19.
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